The others could not be reached. They were reportedly accused of stealing sunglasses from a Louis Vuitton store that is next to the hotel.
The arrests took place on Tuesday but the players were released on bail.
"They weren't messing around", the source shared. While the three athletes remained in Hangzhou, the rest of UCLA's Bruins basketball team continued their trek to Shanghai to play Georgia Tech on Friday.
An arrest would prompt an investigation that could take up to two additional months before prosecutors bring formal charges, Lewis told the newspaper.
From there the process could stretch out much longer, and convictions are a near certainty in Chinese courts, which are controlled by the ruling Communist Party.
LaVar Ball; his wife, Tina; and LaMelo Ball were having breakfast with the UCLA team in Shanghai on Wednesday morning. Markazi reported the three are still being detained by Chinese police.
"We are aware of the matter involving UCLA student-athletes in Hangzhou, China and we are gathering more information", UCLA Associate Director of Athletic Communications Alex Timiraos said in a statement.
LiAngelo Ball is one of three basketball-playing siblings who have emerged on the national stage in the United States in recent years, fuelled in part by father LaVar's aggressive promotion of his sons as future superstars. On Wednesday, Chinese President Xi Jinping began Trump's visit to the country by taking him on a tour of the Forbidden City.
The players will not play in Saturday's game against Georgia Tech, UCLA Athletics spokeswoman Shana Wilson said.